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Sur d’autres sites (7083)

  • Understanding ffmpeg re parameter

    4 septembre 2024, par formatkaka

    I was reading about the -re option in ffmpeg .
What they have mentioned is

    



    


    From the docs

    
 


    -re (input)

    
 


    Read input at the native frame rate. Mainly used to simulate a grab device, or live input stream (e.g. when reading from a file). Should not be used with actual grab devices or live input streams (where it can cause packet loss). By default ffmpeg attempts to read the input(s) as fast as possible. This option will slow down the reading of the input(s) to the native frame rate of the input(s). It is useful for real-time output (e.g. live streaming).

    


    



    My doubt is basically the part of the above description that I highlighted. It is suggested to not use the option during live input streams but in the end, it is suggested to use it in real-time output.

    



    Considering a situation where both the input and output are in rtmp format, should I use it or not ?

    


  • skvideo + ffmpeg : Can't set path to binaries

    9 août 2021, par fukiburi

    For some reason, setting the path to the ffmpeg binaries doesn't work completely.

    


    While it seems like this works like it should :

    


    import skvideo.io
import skvideo.datasets

ffmpeg_path = "C:/Users/xyz/ffmpeg-4.3.1-win64-static/bin/"
skvideo.setFFmpegPath(ffmpeg_path)
print("FFmpeg path: {}".format(skvideo.getFFmpegPath()))
print("FFmpeg version: {}".format(skvideo.getFFmpegVersion()))

>>> FFmpeg path: C:/Users/xyz/ffmpeg-4.3.1-win64-static/bin/
>>> FFmpeg version: b'4'.b'3'.b'1'


    


    Running these lines directly after does not :

    


    videodata = skvideo.io.vread(skvideo.datasets.bigbuckbunny())
print(videodata.shape)

[...]
>>> File "C:\Users\xyz\Anaconda3\envs\cv_env\lib\site-packages\skvideo\io\io.py", line 133, in vread
  assert _HAS_FFMPEG, "Cannot find installation of real FFmpeg (which comes with ffprobe)."
>>> AssertionError: Cannot find installation of real FFmpeg (which comes with ffprobe).


    


    Can't figure out, why it's not set correctly...

    


  • How to get raw bytestring from AudioSegment

    14 juillet 2023, par Yingrjimsch

    Hello I'm trying to get the raw bytestring out of pydub AudioSegment.

    


    I've already tried following :

    


    sound = AudioSegment.from_mp3(file="../source/myfile.mp3")
bytestring = sound.raw_data


    


    and

    


    sound = AudioSegment.from_mp3(file="../source/myfile.mp3")
bytestring = sound._data


    


    but in my case it returns always a bytestring of with len 686866320 Bytes.

    


    if I export it instead to a bytes array like following :

    


    sound = AudioSegment.from_mp3(file="../source/myfile.mp3")
bytes = io.BytesIO()
bytes = sound.export(bytes, format='mp3')


    


    I'm getting a much smaller len of 62301665.

    


    At the end I'd like to have a bytestring and it's real size which (in my case is the real filesize of 62301665) but I cannot figure out how export reduces / compresses the data. The plain datastring of sound.raw_data cannot be played either.

    


    Thank you for any help :)

    


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